reorganizing server-related packages

src/server/router/context.go

@@ -0,0 +1,61 @@
+package router
+
+import (
+	"encoding/json"
+	"fmt"
+	"html/template"
+	"log"
+	"net/http"
+	"strconv"
+)
+
+type Context struct {
+	Req *http.Request
+	Out http.ResponseWriter
+
+	Vars map[string]string
+
+	chain []Handler
+	index int
+}
+
+func (c *Context) Next() {
+	c.index++
+	c.chain[c.index](c)
+}
+
+func (c *Context) JSON(status int, data interface{}) {
+	body, err := json.Marshal(data)
+	if err != nil {
+		log.Fatal(err)
+	}
+	c.Out.WriteHeader(status)
+	c.Out.Header().Set("Content-Type", "application/json; charset=utf-8")
+	c.Out.Write(body)
+	c.Out.Write([]byte("\n"))
+}
+
+func (c *Context) HTML(status int, tmpl *template.Template, data interface{}) {
+	c.Out.WriteHeader(status)
+	c.Out.Header().Set("Content-Type", "text/html")
+	tmpl.Execute(c.Out, data)
+}
+
+func (c *Context) VarInt64(key string) (int64, error) {
+	if val, ok := c.Vars[key]; ok {
+		return strconv.ParseInt(val, 10, 64)
+	}
+	return 0, fmt.Errorf("no such var: %s", key)
+}
+
+func (c *Context) QueryInt64(key string) (int64, error) {
+	query := c.Req.URL.Query()
+	return strconv.ParseInt(query.Get(key), 10, 64)
+}
+
+func (c *Context) Redirect(url string) {
+	if url == "" {
+		url = "/"
+	}
+	http.Redirect(c.Out, c.Req, url, http.StatusFound)
+}